Page 37 - Threading_Handbook

Helix (Lead) Angle Area by Using Graph

Helix Angle Evaluation

φ(φL) φ(φL) φ(φL) φ(φL) φ(φL)
5° 4° 3° 2° 1°
10
9.5 THREAD TURNING
9
8.5
8
7.5
7
6.5
Pitch / Lead [mm] 5.5
6

5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Diameter [mm]

Detailed View for Small Pitch/Diameter

φ(φL) φ(φL) φ(φL)
5° 4° 3°
1.5
1.4
1.3
1.2 φ(φL)
1.1 2°
Pitch / Lead [mm] 0.9
1

0.8
0.7
0.6 φ(φL)
1°
0.5
0.4
0.3
0.2
0.1
0
0 1 2 3 4 5 6 7 8 9 10
Diameter [mm]

37